Planet Bike Superflash Stealth bike tail light High output surface mounted LED plus 2 5mm LEDs provide steady & Superflash modes Run times: 60 hrs (steady  7 lm) and up to 100 hrs (Superflash - 7 lm) Highly visible, even in daylight Water resistance rated to IPX6 standard 2 AAA batteries (included) Rear bicycle light with eye-catching red flash pattern Offers 1/2-watt Blaze red LED and 2 eXtreme LEDs Lightweight, ultra-compact, weatherproof housing Attaches to almost any bike via bike mounts and clip mount 1-mile visibility; runs for 100 hours on 2 AAA batteries